啥是3d打印:at the doctors是什么意思

at the doctors是什么意思 at the moment是什么意思？ at the appointed time 是什么意思？ at the other end 是什么意思 at the same instant是什么意思 he was taken to h_____ at once but the doctors did not save him and he died soon . the most at the best price是什么意思? what do doctors do?是什么意思? at the sound of tone中文是什么意思 老外说的“begin at the end”是什么意思？